Exception while hidden

[ChrisBoothroyd@…]

What steps will reproduce the problem?

What is the expected result?

What happens instead?

Please provide any additional information below. Attach a screenshot if possible.

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-09-06 00:16:07 +0200 (Tue, 06 Sep 2016)
Build-Date:2016-09-05 22:21:00
Revision:10966
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10966 en_GB) Mac OS X 10.11.6
Memory Usage: 625 MB / 7282 MB (197 MB allocated, but free)
Java version: 1.8.0_101-b13, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: Display 69733250 1680x1050
Maximum Screen Size: 1680x1050
VM arguments: [-Djava.library.path=/Applications/josm-macosx 10966/JOSM.app/Contents/MacOS, -DLibraryDirectory=${HOME}/Library, -DDocumentsDirectory=${HOME}/Documents, -DApplicationSupportDirectory=${HOME}/Library/Application Support, -DCachesDirectory=${HOME}/Library/Caches, -DSandboxEnabled=false, -Dapple.laf.useScreenMenuBar=true, -Dcom.apple.macos.use-file-dialog-packages=true, -Dcom.apple.macos.useScreenMenuBar=true, -Dcom.apple.mrj.application.apple.menu.about.name=JOSM, -Dcom.apple.smallTabs=true]
Dataset consistency test: No problems found

Plugins:
+ ElevationProfile (32868)
+ PicLayer (32796)
+ editgpx (32699)
+ reverter (32796)
+ turnrestrictions (32796)
+ undelete (32699)

Last errors/warnings:
- W: Unable to get color from '' for color preference 'improve.way.accuracy.helper.line'
- W: Unable to get color from '' for color preference 'make.parallel.helper.line'
- W: java.net.UnknownHostException: api.openstreetmap.org
- W: Already here java.net.UnknownHostException: api.openstreetmap.org
- E: java.net.UnknownHostException: api.openstreetmap.org
- W: org.openstreetmap.josm.io.OsmTransferException: Could not connect to the OSM server. Please check your internet connection.. Cause: java.net.UnknownHostException: api.openstreetmap.org
- W: java.net.ConnectException: Network is unreachable
- W: Already here java.net.UnknownHostException: api.openstreetmap.org
- E: java.net.ConnectException: Network is unreachable
- W: org.openstreetmap.josm.io.OsmTransferException: Could not connect to the OSM server. Please check your internet connection.. Cause: java.net.ConnectException: Network is unreachable


=== REPORTED CRASH DATA ===
BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-0 (18) of main
java.lang.IllegalArgumentException: Comparison method violates its general contract!
	at java.util.TimSort.mergeHi(TimSort.java:899)
	at java.util.TimSort.mergeAt(TimSort.java:516)
	at java.util.TimSort.mergeCollapse(TimSort.java:441)
	at java.util.TimSort.sort(TimSort.java:245)
	at java.util.Arrays.sort(Arrays.java:1438)
	at sun.awt.datatransfer.DataTransferer.setToSortedDataFlavorArray(DataTransferer.java:2410)
	at sun.awt.datatransfer.DataTransferer.getFlavorsForFormatsAsArray(DataTransferer.java:873)
	at sun.awt.datatransfer.SunClipboard.getAvailableDataFlavors(SunClipboard.java:171)
	at org.openstreetmap.josm.gui.datatransfer.OsmTransferHandler.isDataAvailable(OsmTransferHandler.java:91)
	at org.openstreetmap.josm.actions.AbstractPasteAction.updateEnabledState(AbstractPasteAction.java:96)
	at org.openstreetmap.josm.actions.AbstractPasteAction.flavorsChanged(AbstractPasteAction.java:101)
	at sun.awt.datatransfer.SunClipboard$1SunFlavorChangeNotifier.run(SunClipboard.java:441)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)